Use shorthand, make it so that people won't understand what it is unless they talk to you.

grp_td_hr_emprec

vw_gd_eng_cirtest

Way way back, about 8 or 9 years ago at a former employer that I liked, someone was using a DOS based database called Screwnut and Washbolt to keep track of screws and nuts and washers and bolts at the factories. I had the task of converting the database into Access. It was fun, as were the database table names.